<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <script type="text/javascript">
      alert([1,2]==[1,2]);   // let arr=new Array(1,2);
      alert({a: 1,b: 1}=={a: 1,b: 1}); //let json=new Object();json.a=1;json.b=1;
    </script>
  </head>
  <body>

  </body>
</html>
